package com.admin.framework.interceptor.impl;

import com.admin.common.json.JSON;
import com.admin.framework.interceptor.RepeatSubmitInterceptor;
import org.springframework.stereotype.Component;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;
import java.util.HashMap;
import java.util.Map;

/**
 * 判断请求url和数据是否和上一次相同，
 * 如果和上次相同，则是重复提交表单。 有效时间为10秒内。
 *
 * @author fangchen
 */
@Component
public class SameUrlDataInterceptor extends RepeatSubmitInterceptor {
    public final String REPEAT_PARAMS = "repeatParams";

    public final String REPEAT_TIME = "repeatTime";

    public final String SESSION_REPEAT_KEY = "repeatData";

    /**
     * 间隔时间，单位:秒 默认10秒
     * <p>
     * 两次相同参数的请求，如果间隔时间大于该参数，系统不会认定为重复提交的数据
     */
    private int intervalTime = 10;

    public void setIntervalTime(int intervalTime) {
        this.intervalTime = intervalTime;
    }

    @SuppressWarnings("unchecked")
    @Override
    public boolean isRepeatSubmit(HttpServletRequest request) throws Exception {
        // 本次参数及系统时间
        String nowParams = JSON.marshal( request.getParameterMap() );
        Map<String, Object> nowDataMap = new HashMap<String, Object>();
        nowDataMap.put( REPEAT_PARAMS, nowParams );
        nowDataMap.put( REPEAT_TIME, System.currentTimeMillis() );

        // 请求地址（作为存放session的key值）
        String url = request.getRequestURI();

        HttpSession session = request.getSession();
        Object sessionObj = session.getAttribute( SESSION_REPEAT_KEY );
        if (sessionObj != null) {
            Map<String, Object> sessionMap = (Map<String, Object>) sessionObj;
            if (sessionMap.containsKey( url )) {
                Map<String, Object> preDataMap = (Map<String, Object>) sessionMap.get( url );
                if (compareParams( nowDataMap, preDataMap ) && compareTime( nowDataMap, preDataMap )) {
                    return true;
                }
            }
        }
        Map<String, Object> sessionMap = new HashMap<String, Object>();
        sessionMap.put( url, nowDataMap );
        session.setAttribute( SESSION_REPEAT_KEY, sessionMap );
        return false;
    }

    /**
     * 判断参数是否相同
     */
    private boolean compareParams(Map<String, Object> nowMap, Map<String, Object> preMap) {
        String nowParams = (String) nowMap.get( REPEAT_PARAMS );
        String preParams = (String) preMap.get( REPEAT_PARAMS );
        return nowParams.equals( preParams );
    }

    /**
     * 判断两次间隔时间
     */
    private boolean compareTime(Map<String, Object> nowMap, Map<String, Object> preMap) {
        long time1 = (Long) nowMap.get( REPEAT_TIME );
        long time2 = (Long) preMap.get( REPEAT_TIME );
        if ((time1 - time2) < (this.intervalTime * 1000)) {
            return true;
        }
        return false;
    }
}
